Mechanisms of chronic airway obstruction in smokers.
D001991:Bronchitis / Q000209:etiology; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000209:etiology*; D012307:Risk Factors; D012906:Smoke / Q000009:adverse effects; D012907:Smoking / Q000009:adverse effects*
D012906:Smoke